{"uid":"cap_N9Am7FtEkMpjTqcfTqj1t","slug":"xynaptic-crypto-fear-greed-index-5453f42c","name":"Xynaptic Crypto Fear & Greed Index","description":"Xynaptic Crypto Fear & Greed — the market sentiment thermometer (alternative.me index, 0-100): current value, yesterday, last week, classification (extreme fear..extreme greed) + interpretation hint for agents. GET no params.","url":"https://api.xynaptic.io/v1/crypto-fear-greed?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_EFCdI496kCbsOp64JwE-G","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current crypto market sentiment score (0-100) with classification and interpretation, using the alternative.me Fear & Greed index, plus yesterday's and last week's values.","exampleAgentPrompt":"What's the current crypto fear and greed index — is the market in extreme fear or greed right now, and how does it compare to yesterday and last week?","exampleUseCases":[{"title":"Pre-trade sentiment check","prompt":"Before I make any crypto moves today, what's the fear and greed index reading right now — and is the market sentiment better or worse than last week?"},{"title":"Automated daily market briefing","prompt":"Include today's crypto fear and greed score with its classification in my morning market summary, alongside how sentiment has shifted since yesterday."},{"title":"Contrarian investment signal","prompt":"Is the crypto market currently in extreme fear? I want to know the fear and greed index value and classification so I can look for potential buying opportunities."}],"resultDescription":"Returns a JSON object with the current fear & greed index value (0-100), its text classification (e.g. 'Extreme Fear', 'Fear', 'Neutral', 'Greed', 'Extreme Greed'), the equivalent values for yesterday and last week, and an interpretation hint to help agents act on the data.","failureModes":["Upstream alternative.me index unavailable — returns error or stale data","Rate limiting if called excessively in a short period","Payment failure (x402) if USDC balance is insufficient — returns 402 status"],"whenToPreferThis":"Choose this endpoint when you need a quick, pre-aggregated crypto market sentiment snapshot without building your own data pipeline. It is ideal for agents that need to contextualize trading decisions, include sentiment in reports, or trigger workflows based on market mood. It wraps the widely-trusted alternative.me index with agent-friendly interpretation hints, making it more actionable than raw index feeds.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T00:44:47.843Z","isFirstParty":false,"canonicalSlug":"xynaptic-crypto-fear-greed-index-5453f42c"}